Gearing.



H. ALLEN.

GEARING.

APPLICATION FILED SEPT. 22, 1905.

1,675,280. Patented 0ct.7,1913.

3 SHEETSSHEET 1.

1; lit-6012395 JQW H. ALLEN.

GEARlNG APPLIGATION FILED SEPT. 22, 1905.

1,075,280. Patented Oct. 7, 1913.

3 SHEETS-SHEET 2.

. Java/0 g JZlLerV Hawk/re 5 H. ALLEN.

GEARING.

APPLIGATION FILED SEPT. 22, 1905.

1,075,280. Patented Oct. 7, 1913.

3 SHEETSSHEET 3.

ATE FFEQE.

HARDING ALLEN, 0F BARBIE, MASSACHUSETTS.

GEARING.

Application filed September 22, 1905.

Specification of Letters Patent.

Patented (lot. 7, 1913.

Serial No. 279,641.

To all whom it may concern Be it known that I, HARDING ALLEN, a citizen of the United States, residing at Barre, in the county of Worcester and State of Massachusetts, have invented a new and useful Gearing, of which the following is a specification.

This invention relates to improvements in the spindle driving mechanism of a drillpress.

The especial objects of this invention are to provide improved means for mounting and adjusting a quarter-turn belt so that a drill-spindle may be powerfully driven, the pulleys maintained in proper running relation with respect to the belt, and the speed of the drill and tightness of the belt changed by simple, direct and convenient adjustments.

A further object of this invention is to drive the spindle of a drill-press from a simple and efiicient form of telescopic pulley having its sliding rim connected with the hub or shaft on which it is mounted, so that the same can be moved into or out of operative position without loosening nuts or other fastenings.

To these ends this invention consists of the drill-press, and the combinations of parts therein as hereinafter described and more particularly pointed out in the claims at the end of this specification.

In the accompanying three sheets of drawings, Figure 1 is a side view partly broken away of a drill-press constructed according to this invention. Fig. 2 is an enlarged plan view thereof. Fig. 3 is a partial side view thereof partly broken away. Fig. at is a detail view of the automatically adjusted bracket on which one of the quarter turn pulleys is mounted. Fig. 5 is a fragmentary view of the sliding plate. Fig. 6 is a per spective view of the guide for automatically adjusting one of the quarter-turn pulleys. Fig. 7 is a partial side view from the opposite side of the machine from that shown in Fig. 3. Fig. 8 is a detail View of the double driving pulley. Fig. 9 is a view similar to Fig. 8 showing the smaller one of the telescoping pulleys, and Fig. 10 is a detail view showing the slotted hub receiving the pin or stud of the outside pulley.

In that class of drill-presses to which this invention relates the drill spindle is driven by a quarter turn belt from the main driving shaft.

In order to secure variations in the speed of the drill spindle, a number of dilferent adjustments have hereto-fore been made by hand, and in some cases when the belt pulleys are not properly adjusted, it is difficult to keep the belt from running ofi its pulleys.

In a drill-press constructed according to this invention, the parts have been particularly designed to secure an automatic adj ustment of the belt pulleys, whereby said belt pulleys will be maintained in proper position whether the machine is adjusted either for high or low spindle-speeds, or whether the pulleys are moved back or forth to any required extent to tighten the driving belt.

To change from high to low speed or vice versa, I preferably employ telescopic driving pulleys, the larger of which has a rim which can be moved out of the way when a low cutting speed is desired, and which is splined or connected to the hub of the low speed driving pulley by an elbow keyway or bayonet joint, whereby the tension of the driving belt will hold the large rim in driving position without the use of fastening nuts or screws.

Referring to the accompanying drawings and in detail as shown in Fig. 1, B designates the base part of the pedestal or column of the drill. Extending forward and adjust-ably fastened to the front of the base 13 is the work carrying table T. Extending rearwardly from the base B is the bracket or frame F. Fastened to and extending up from the base B is a column or upper part of the pedestal P. Journaled in the overhanging arm of the pedestal P is the drill spindle S which extends down through the head H which can be adjusted up and down on ways on the pedestal. These parts may be of the ordinary or approved construction and need not be herein described at length.

Journaled in the bracket or frame F is a driving shaft 11 having tight and loose pulleys 12 to which power may be applied by a belt 13. Cooperating with the driving belt 18 are shipper fingers 1a which may be operated by a handle 15 to shift the driving belt from the loose to the tight pulley or vice versa, as desired.

Mounted on the driving shaft 11 are telescopic pulleys which can be adjusted to drive the spindle S through a quarter turn belt at a high speed or at a low speed as desired. The construction of these pulleys is most clearly illustrated in Figs. 8-10. As shown in these figures, a small pullry 16 having an elongated hub 17 is fastened on the driving shaft by a screw 18. Loosely mounted on the hub 17 is a hub 19 having radiating arms carrying an overhanging belt flange 20. The hub 19 is connected to the hub 17 by a screw 21 which enters the off-set keyway or bayonet locking groove 22. l/Vhen the pin or key 21 of the large sized pulley is in the off-set portion of the groove 22, the belt tension of the quarter turn belt 23 will prevent said pulley from moving laterally, but when the slow cutting speed for the drill spindle is desired, the machine may be stopped and the large sized pulley moved back out of the way as shown in Fig. 9. I regard this connection between the large sized driving pulley and smaller sized driving pulley by means of a bayonet lock key-way as a particularly desirable feature in practice, as it enables me to set and adjust my telescopic pulleys without tightening or loosening binding screws or similar fastenings.

As shown in Fig. 1, the drill spindle S has a twostep cone pulley 24 and 25 splined thereon, and this cone pulley is driven from the quarter turn belt 23. The belt passes over the idlers or quarter turn pulleys 26 and 27. The idlers or quarter turn pulleys 26 and 27 are mounted so that they may be moved up and down according to whether the belt is to be run upon the upper Section 24 or the lower section 25 of the spindle cone pulley. This is accomplished by a vertically movable apron or bracket 28.

As shown most clearly in Fig. 7, the vertically movable bracket or apron 28 is connected by a link 30 to a lifting lever 29. When the lifting lever 29 is drawn forward to the position illustrated in Fig. 7, the point of connection to the apron or bracket 28, the point of connection 32 of the link to the lifting lever, and the pivotal point 33 of said lever form in effect a toggle joint which is thrown slightly past its center of motion and which will lock the idler pulleys in raised position; while by throwing the lift ing lever 29 back as shown in Fig. 1, the apron 28 will be lowered to the position therein shown. The tension of the driving belt 23 is regulated by moving the quarter turn pulleys back and forth on the apron 28.

As shown in Fig. 2, I preferably use a sliding plate or carriage or part 34, and as shown in Fig. 3, the sliding plate or carriage 34 is provided with a nut threaded on to a lead-screw 36, which lead-screw 3G is connected by bevel gears to a shaft 37 carrying a hand-wheel 38. By turning the handwheel 38 the idle pulleys can be moved back or forth as required to secure the proper belt tension. The adjusting wheel 38 is located in convenient position to be reached from the front of the machine. I regard this as a desirable feature in ractice, because without stopping the drllling operation, the workman can very readily increase the belt tension whenever the drilling strain is sufficient to slow down or stop the drill; while on the other hand, the workman can very readily slack the belt tension when he finds the same to be unnecessarily heavy. The quarter turn pulley 26 is journaled directly in bearings in the sliding carriage or plate 34.

In order that the quarter turn pulley 27 may have its belt face presented in proper position to receive the returning or driving strain of the driving belt 23, it is necessary that the pulley should be swung or moved whenever the quarter turn pulleys are raised or lowered or whenever the belt is tightened by moving the quarter turn pulleys forward or back on their carriage. I have provided automatic means for maintaining the proper adjustment of the quarter turn pulley 27.

As shown in Figs. 4 and 5 the quarter turn pulley 27 is journaled in a bracket 39 which is pivoted on a pin 40 in the plate or carriage 34. Extending from the bracket 39 is a pin 41 which engages a guide-way 42 in an operating piece 43. The operating-piece is provided near one end with a slot 44 for receiving a screw 45 which sets into 2. lug on the apron or bracket 28, and at its other end the operating-piece 43 has a slot 46 for receiving a fastening screw 47.

When the parts are in the position illustrated in Fig. 2 the quarter turn pulley 27 has its face presented in proper position to receive the belt from the larger step 25 of the spindle cone. hen the belt is running upon the smaller step 24 of the spindle cone, the quarter turn pulley 27 should be swung in the direction indicated by the arrow in Fig. 2. To accomplish this, the operating piece 43 is provided at its end with a pivoted pin 48 connected by a link 49 to a pin secured in the upwardly extending arm of the bell-crank lever 50.

As shown most clearly in Fig. 3, the bell-crank lever 50 is pivoted near its angle in a yoke 51 carried by the apron 28, and the other end of the bell-crank lever 50 is slotted to receive a pin 52, secured in the pedestal P. By means of these connections when the apron 28 is raised to present the quarter turn pulleys in position so that the driving belt may run on the smaller section 24 of the spindle cone, the operating piece 43 will be automatically drawn forward and the cam grooves of the operating piece will shift the same laterally and also swing the same slightly so that the quarter turn pulley 27 will be automatically set to position, so

that its face will stand at the proper angle to receive the belt returning from the smaller section 2st of the cone pulley, and in addition to this, when the quarter turn pul leys are moved to tension the driving belt, the operating piece will also serve to swing or turn the quarter turn pulley 27 to proper position. This action will take place as the groove l2 stands at a slight incline to the line of movement of the sliding plate or carriage 34.

I regard the automatic adjustment of the quarter turn pulley 2'? as a particularly important feature of my invention, because by adopting this construction I have been enabled to provide a drill-press in which the belt pulleys will always be maintained in proper running relation with respect to each other; while, at the same time, the belt pulleys may be shifted by direct and simple connections from the front of the machine to change the spindle speed or adjust the ten sion of the driving belt as required.

In practical operation I employ a driving belt having its ends skived and cemented together so as to make a substantially endless belt which will run smoothly, and I am enabled to secure a maximum drilling efficiency for the reason that the workman can very readily change the belt tension to either do heavy drilling or to run with light tension when less work is required, this being accomplished directly from the front of the machine without liability of mis-adjusting the belt pulleys.

In the particular machine which I have herein illustrated and described, it will be seen that the quarter turn pulleys are arranged substantially one in front of the other so that a wrap around more than onehalf of the circumference is secured whether the driving belt is being run upon the small section of the spindle cone, or upon the large section of the spindle cone.

A principal characteristic of a drill-press embodying my invention is that four drilling speeds may be obtained in a simple and direct way. When the quarter turn belt is running on the larger of the telescopic pul leys and on the smaller face of the spindle cone, the drill spindle will be turned at its highest speed. Three different slower speeds may be obtained; the first when the belt is running on the smaller one of the telescopic pulleys and the smaller step of the spindle cone; the second when the belt is running on the larger one of the telescopic pulleys and the larger step of the spindle cone; and the third when the belt is running on the smaller one of the telescopic pulleys and the larger step of the spindle cone.

A further characteristic of a drill-press embodying this invention arises from the fact that the idle pulleys are moved simultaneously and since each idle pulley is located in a loop or angle of the belt, the

simultaneous adjustment of the idle pulleys will take up twice the length of belt which would be taken up by the adjustment of a single idler.

A still further characteristic of a drillpress embodying this invention is due to the fact that the driving shaft is at right-angles with but is in a different plane from the drill spindle instead of being arranged radially with respect thereto. I regard this location of the driving shaft as particularly advantageous as it enables me to use the same driving shaft for a number of drill spindles where my invention is embodied in gang drills.

I am aware that changes may be made in the design and construction of drill-presses by those who are skilled in the art without departing from the scope of my invention as expressed in the claims, and that certain features of my invention may be used in different locations and in different constructions if desired.

I do not wish, therefore, to be limited to the particular machine which I have herein shown and described, but

hat I do claim and desire to secure by Letters-Patent of the United States is 1. In a construction of the class described, the combination of a vertical shaft to be driven, a horizontal driving shaft at rightangles with but in a different plane from the vertical shaft, a double-faced driving pulley on the horizontal shaft, a double-faced pulley on the vertical shaft, a quarter-turn belt, two idle pulleys, and automatically operating means for adjusting the idle pulleys to guide and tension the belt so that the belt may run on either face of the driving and driven pulleys, whereby four speed changes may be secured.

2. In a construct-ion of the class described, the combination of a driving pulley, a pulley to be driven, a quarter-turn belt, two idle pulleys, means for simultaneously shifting the idle pulleys to adjust the belt tension, and means whereby the idle pulleys will automatically assume the proper position as they are adjusted.

3. In a construction of the class described, the combination of a driving pulley, a pulley to be driven, a quarter-turn belt, two idle pulleys, a movable plate supporting said idle pulleys, means for moving the plate to shift the idle pulleys and adjust the belt tension, and-means whereby the idle pulley which directs the side of the belt which passes from the driven to the driving pulley will be automatically turned so that it will properly guide the belt.

4. ln a drill, the combination of a hori Zontal driving shaft and driving pulley, a vertical spindle, a pulley thereon to be driven, a quarter-turn belt, two idle pulleys,

a movable plate carrying said idle pulleys, a lead-screw, a hand-wheel located in position to be operated from the same side of the machine as the spindle to adjust the belt tension, and bevel gears connecting the hand-wheel to the leadscrew.

5. In a construct-ion of the class described, the combination of a driving pulley, a pulley to be driven, two idle pulleys, and means for automatically controlling the angular position of one of the idle pulleys so as to properly receive the belt thereon.

6. In a construction of the class described, the combination of a driving pulley, a pulley to be driven, a quarter turn belt, two idle pulleys, means for adjusting the idle pulleys to regulate the belt tension, and means op erated by the adjustment of the idle pulleys for regulating the angular position of the returning idle pulley to properly receive the belt.

7 In a construction of the class described, the combination of a driving pulley, a stepcone pulley to be driven, a quarter turn belt, two idle pulleys, and a single operating instrumentality for raising and lowering the idle pulleys to guide the beltonto the larger or smaller part of the step-cone as desired.

8. In a drill, the combination of a horizontal driving shaft, a driving pulley thereon, a vertical spindle, a step-cone pulley thereon, a quarter turn belt, two idle pulleys, a vertically movable apron carrying the idle pulleys, and a pair of toggle links for raising and holding the idle pulleys in raised position when the upper section of the stepcone is to be used.

9. In a construction of the class described, the combination of a horizontal driving shaft, a driving pulley thereon, a vertical shaft, a step-cone pulley thereon, a quarter turn belt, two idle pulleys, means for raising and lowering the idle pulleys, and means operated by the raising and lowering of said idle pulleys for adjusting the angular position of one of said idle pulleys to properly receive the return section of the belt.

10. In a construction of the class described, the combination of a driving pulley,

a pulley to be driven, a quarter turn belt, two idle pulleys, a pivoted bearing-box for one of the idle pulleys, and an operating piece having a pin-and-slot connection with the pivoted box, whereby the angular position of the idle pulley mounted in the pivoted box will be automatically adjusted to receive the returning part of the belt when there is a relief movement between the pivu-UeCl box and the operating piece.

11. In a construction of the class described, the combination of a driving pulley, a pulley to be driven, a quarter turn belt, two idle pulleys, a sliding plate carrying said idle pulleys, a lead-screw for moving the sliding plate to adjust belt tension,

a pivoted bearing box, an operating piece, and a pin-and-slot connection between the operating piece and the pivoted bearing boX for automatically maintaining one of the idle pulley in proper angular adjustment to receive the returning part of the driving belt.

12. In a construction of the class described, the combination of a horizontal driving shaft, a driving pulley thereon, a vertical shaft, a. step-cone pulley thereon, a quarter turn belt, two idle pulleys, means for raising and lowering the idle pulleys to guide the belt onto the upper or lower part of the step-cone pulley, and means operated by the raising and lowering of the idle pulleys to keep one of the idle pulleys in proper angular adjustment to receive the returning part of the driving belt.

13. In a construction of the class described, the combination of a horizontal driving shaft, a driving pulley thereon, avertical shaft, a step-cone pulley on the vertical shaft, a quarter turn driving belt, two idle pulleys, a vertically movable apron carrying the idle pulleys, means for raising and lowering the apron so that the idle pulleys will guide the belt onto the upper or lower part of the step-cone pulley, a pivoted bearing-box for one of the idle pulleys, a sliding operating piece having a pin-and-slot connection with the pivoted box, and a. bellcrank lever pivoted to the vertically movable apron, and having one arm connected by a pin-and-slot connection at a fixed point, and the other arm connected by a link to the operating piece, whereby the raising and lowering of the idle pulleys will automatically adjust the position of one of the idle pulleys to receive the returning part of the belt.

14. In a construction of the class described, the combination of a shaft, and telescopic driving pulleys mounted thereon and comprising a driving pulley of small diameter, a laterally shiftable driving pulley of larger diameter with a spline and keyway connection for the larger pulley having a bayonet lock, whereby belt tension applied to the larger pulley will tend to lock the same in operative position.

15. In a construction of the class described, the combination of a driving shaft, and telescopic driving pulleys comprising a pulley of small diameter fixed to the driving shaft, a laterally movable pulley having an overhanging belt flange of large diameter, and having its hub laterally movable upon the hub of the smaller pulley, with a keyand-slot driving connection between said pulleys formed with a bayonet look at one end, whereby tension applied to the larger end of the driving pulley will tend to hold the same in operative position.

16. In a drill, the combination of a horizontal driving shaft, telescopic driving pulleys thereon comprising a pulley of smaller diameter, av laterally shiftable pulley of larger diameter having a key-and-slot connection with a bayonet lock at one end thereof, whereby belt tension will tend to hold the pulley of larger diameter in operative position, a vertical spindle, a step-cone pulley mounted on the spindle, a quarter turn belt, two idle pulleys, means for moving the idle pulleys horizontally to adjust belt tension, means for raising and lowering the idle pulleys to guide the belt onto the upper or lower part of the step-cone pulley, and means automatically operated by either adjustment of the idle pulleys to maintain one of the idle pulleys in proper angular adjustment to receive the returning part of the driving belt.

17. In a drill-press, the combination of a horizontal driving shaft, pulleys thereon, a vertical spindle, pulleys thereon, a quarter turn belt, idlers for guiding the quarter turn belt, a plate or piece carrying one of the idlers, a lead-screw for adjusting the plate, and means for operating the lead-screw located in position to be operated from the front of the machine whereby the user may adjust the belt tension without leaving drilling position.

18, ln a drill press, the combination of a.

horizontal driving shaft, a plurality of driving pulleys thereon, a vertical spindle, a plurality of driven pulleys thereon, a quarter turn belt, idlers for guiding the quarter turn belt so that the same will run from either driving pulley to either driven pulley, a plate or piece carrying the idlers, and means for adjusting the plate to tension the belt.

19. In a machine of the class described, the combination of a machine frame, a pmver shaft extending lengthwise thereof, a plurality of driving pulley faces mounted thereon, each designed to run in the same plane of rotation when at work, a vertical driven spindle, a pulley mounted thereon, a belt, idlers interposed between said driving shaft and said driven shaft, said idlers having means for horizontal adjustment.

20. In a drill press the combination of a driving pulley rotatable in a vertical plane, a spindle cone pulley rotatable in a horizontal plane, a belt arranged to drive the latter from the former pulley, a swiveled idler for one stretch of the belt, a vertically adjustable idler for the other stretch thereof, and ncans for simultaneously moving the idlers for changing the tension of the belt.

21. in a construction of the class described, the combination of a frame, a horizontal driving shaft extending lengthwise of the frame, a pulley thereon, a vertical driven shaft, a pulley thereon, idle pulleys, a quarter turn belt for transmitting power from the driving to the driven shaft, a movable part, a pulley support swiveled or pivoted thereon, which support carries the return pulley, and means for adjusting said part to tension the belt.

9-2. In a machine of the class described, the combination of a frame, a horizontal driving shaft extending lengthwise of the frame, a pair of pulleys thereon arranged so that each will run in the same plane of rotation when at work, a vertical driven shaft, a pulley thereon, idle pulleys, a quarter turn belt for transmitting power from the driving to the driven shaft, and an adjusting device operable from the front of the machine for moving an idler pulley horizontally.

In a machine of the class described, the combination of a frame, a horizontal driving shaft extending lengthwise of the frame, a pair of pulleys thereon arranged so that each will run in the same plane of rotation when at work, a vertical driven shaft, a pair of pulleys thereon, idle pulleys, a quarter turn belt for transmitting power from the driving to the driven shaft, and an adjusting device operable from the front of the machine for moving an idler vertically.

2 1-. In a machine of the class described, the combination of a frame, a horizontal driving shaft extending lengthwise of the frame, a pair of pulleys thereon arranged so that each will run in the same plane of rotation when at work, a vertical driven shaft, a pair of pulleys thereon, idle pulleys, a quarter turn belt for transmitting power from the driving to the driven shaft, an adjusting device operable from the front of the machine for moving an idler horizontally, and another adjusting device operable from the front of the machine for moving an idler vertically.

In a machine of the class described, the combination of a frame, a horizontal driving shaft extending lengthwise of the frame, a plurality of pulleys thereon, a vertical driven shaft, a plurality of pulleys thereon, idle pulleys, a quarter turn belt for transmitting power from the driving to the driven shaft, a vertically movable apron, means for adjusting the same to either one of two vertical positions so that the belt can run around either pulley on the vertical spindle, a movable part mounted on said apron, a pulley support swiveled or pivoted thereon, which support carries one of the idle pulleys, and means for adjusting said part to tension the belt or to adjust the belt so that it can be driven from either pulley of the driving shaft.

26. In a machine of the class described, the combination of a frame, a horizontal driving shaft extending lengthwise of the frame, a plurality of pulleys thereon, a

vertical driven shaft, a plurality of pulleys thereon, idle pulleys, a quarter turn belt for transmitting power from the driving to the driven shaft, a vertically movable apron, means operable from the front of the machine for adjusting the same to either one of two vertical positions so that the belt can run around either pulley on the vertical spindle, a movable part mounted on said apron, a pulley support swiveled or pivoted thereon, which support carries one of the idle pulleys, and means for adjusting said part to tension the belt or to adjust the belt so that it can be driven from either pulley of the driving shaft.

27. In a machine of the class described, the combination of a frame, a horizontal driving shaft extending lengthwise of the frame, a plurality of pulleys thereon, a vertical driven shaft, a plurality of pulleys thereon, idle pulleys, a quarter turn belt for transmitting power from the driving to the driven shaft, a vertically movable apron, means for adjusting the same to either one of two vertical positions so that the belt can run around either pulley on the vertical spindle, a movable part mounted on said apron, a pulley support swiveled or pivoted thereon, which support carries one of the idle pulleys, and means operable from the front of the machine for adjusting said part to tension the belt or to adjust the belt so that it can be driven from either pulley of the driving shaft.

28. In a machine of the class described, the combination of a frame, a horizontal driving shaft extending lengthwise of the frame, a plurality of pulleys thereon, a ver tical driven shaft, a plurality of pulleys thereon, idle pulleys, a quarter turn belt for transmitting power from the driving to the driven shaft, a vertically movable apron, means operable from the front of the machine for adjusting the same to either one of two vertical positions so that the belt can run around either pulley on the vertical spindle, a movable part mounted on said apron, a pulley support swiveled or pivoted thereon, which support carries one of the idle pulleys, and means operable from the front of the machine for adjusting said part to tension the belt or to adjust the belt so that it can be driven from either pulley of the driving shaft.

29. In a machine of the class described, the combination of a frame, a horizontal driving shaft extending lengthwise of the frame, a plurality of pulleys thereon, a vertical driven shaft, a plurality of pulleys thereon, idle pulleys, a quarter turn belt for transmitting power from the driving to the driven shaft, a vertically movable apron, means for adjusting the same to either one of two vertical positions so that the belt can run around either pulley on the vertical spindle, a movable part mounted on said apron, rigid bearings carried thereby for one idle pulley, a pulley support swiveled or pivoted thereon, which support carries the other idle pulley, and means for adjusting said part to tension the belt or to adjust the belt so that it can be driven from either pulley of the driving shaft.

80. In a machine of the class described. the combination of a frame, a horizontal driving shaft, a. plurality of pulleys thereon, a vertical driven shaft, a plurality of pulleys thereon, idle pulleys, a quarter turn belt for transmitting power from the driving to the driven shaft, a vertically movable apron, means operable from the front of the machine for adjusting the same to either one of two vertical positions so that the belt can run around either pulley on the vertical spindle, a movable slide mounted on said apron, a pulley support swiveled or pivoted thereon, which support carries one of the idle pulleys, means operable from the frontof the machine for adjusting said slide to tension the belt or to adjust the belt so that it can be driven from either pulley of the driving shaft, and means extending from said pulley support arranged so that as any of said adjustments are made, the idle pulley mounted in said support will be turned to position to cause the belt to run correctly on said pulleys.

31. In a machine of the class described, the combination of a frame, a horizontal driving shaft, a plurality of pulleys thereon, a vertical driven shaft, a. plurality of pulleys thereon, idle pulleys, a quarter turn belt for transmitting power from the driving to the driven shaft, a vertically movable apron, means for adjusting the same to either one of two vertical positions so that the belt can run around either pulley on the vertical spindle, a movable slide mount-ed on said apron, rigid bearings carried there- 7 by for one idle pulley, a pulley support swiveled or pivoted thereon, which support carries the other idle pulley, means for ad justing said slide to tension the belt or to adjust the belt so that it can be driven from either pulley of the driving shaft, and means extending from said pulley support arranged so that as any of said adjustments are made, the idle pulley mounted in said support will be turned to position to cause the belt to run correctly on said pulleys.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing witnesses.

HARDING ALLEN.

VVit-nes'ses PHILIP IV. SOUTHGATE, E. M. ALLEN.

Copies of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

